Speciation and longand short-term molecular-level dynamics of soil organic sulfur studied by x-ray absorption near-edge structure Spectroscopy

Dawit Solomon, Johannes Lehmann, Katrin Knoth de Zarruk, Julia Dathe, James Kinyangi, Biqing Liang, Stephen Machado

研究成果: Article同行評審

35 引文 斯高帕斯(Scopus)

摘要

We investigated speciation, oxidative state changes, and longand short-term molecular-level dynamics of organic S after 365 d of aerobic incubation with and without theaddition of sugarcane residue using XANES spectroscopy. Soil samples were collected from theupper 15 cm of undisturbed grasslands since 1880, from undisturbed grasslands since 1931, and from cultivated fields since 1880 in thewestern United States. We found three distinct groups of organosulfur compounds in these grassland-derived soils: (i) strongly reduced (S0 to S1+) organic S that encompasses thiols, monosulfides, disulfides, polysulfides, and thiophenes; (ii) organic S in intermediate oxidation (S2+ to S5+) states, which include sulfoxides and sulfonates; and (iii) strongly oxidized (S6+) organic S, which comprises ester-SO4-S. Th e first two groups represent S directly linked to C and accounted for 80% of thetotal organic S detected by XANES from theundisturbed soils. Aerobic incubation without theaddition of sugarcane residue led to a 21% decline in organanosulfur compounds directly linked to C and to up to an 82% increase inorganic S directly bonded to O. Among theC-bonded S compounds, low-valence thiols, sulfides, thiophenic S, and intermediate-valence sulfoxide S seem to be highly susceptible to microbial attack and may represent themost reactive components of organic S pool in these grassland soils. Sulfonate S exhibited a much lower shortterm reactivity. Th e incorporation of sugarcane residue resulted in an increase in organosulfur compounds directly bonded to C at theearly stage of incubation. However, similar to soils incubated without residue addition, theproportion of organic S directly linked to C continued to decline with increasing duration of aerobic incubation, whereas theproportion of organic S directly bonded to O showed a steady rise.

原文English
頁(從 - 到)704-718
頁數15
期刊Journal of Environmental Quality
40
發行號3
DOIs
出版狀態Published - 2011 5月

All Science Journal Classification (ASJC) codes

  • 環境工程
  • 水科學與技術
  • 廢物管理和處置
  • 污染
  • 管理、監督、政策法律

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